package cn.dgut.training.shiro;


import cn.dgut.training.entity.Admin;
import cn.dgut.training.service.impl.AdminServiceImpl;
import cn.dgut.training.service.impl.PermissionServiceImpl;
import cn.dgut.training.service.impl.RoleServiceImpl;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class AdminAuthorizingRealm extends AuthorizingRealm {

    @Resource
    private AdminServiceImpl adminService;
    @Resource
    private RoleServiceImpl roleService;
    @Resource
    private PermissionServiceImpl permissionService;

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        if (principals == null) {
            throw new AuthorizationException("PrincipalCollection method argument cannot be null.");
        }

        Admin admin = (Admin) getAvailablePrincipal(principals);
        Integer[] roleIds = admin.getArrRoleIds();
        Set<String> roles=new HashSet<String>();
        Set<String> permissions =new HashSet<String>();
        if(roleIds!=null) {
            roles = roleService.queryByIds(roleIds);
            permissions = permissionService.queryByRoleIds(roleIds);
        }
        else{
            roles=null;
            permissions =null;
        }
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        info.setRoles(roles);
        info.setStringPermissions(permissions);
        return info;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {

        UsernamePasswordToken upToken = (UsernamePasswordToken) token;
        String username = upToken.getUsername();
        String password = new String(upToken.getPassword());

        if (StringUtils.isEmpty(username)) {
            throw new AccountException("用户名不能为空");
        }
        if (StringUtils.isEmpty(password)) {
            throw new AccountException("密码不能为空");
        }

        List<Admin> adminList = adminService.findAdmin(username);
        Assert.state(adminList.size() < 2, "同一个用户名存在两个账户");
        if (adminList.size() == 0) {
            throw new UnknownAccountException("找不到用户（" + username + "）的帐号信息");
        }
        Admin admin = adminList.get(0);

        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
        if (!encoder.matches(password, admin.getPassword())) {
            throw new UnknownAccountException("找不到用户（" + username + "）的帐号信息");
        }

        return new SimpleAuthenticationInfo(admin, password, getName());
    }

}
